Jake,
I think I can somewhat picture how your homemade 2.5g bucket idea would work...but just in case, I made a quick diagram to see if we're on the same page.
[IMG][/IMG]
So I've got the exterior bucket as the 2.5g bucket. It has holes drilled in it to allow air to pass through the activated charcoal. The PVC pipe is mounted to the center of the bucket. The space between the PVC and bucket is filled with activated charcoal. The PVC pipe is empty and also has holes drilled in it. And attached to the PVC pipe is a fan sucking the air through the bucket and out the 'top'. And some type of screening or cloth is glued to the inside wall of the bucket and on the outside wall of the PVC?
Is this pretty accurate? Or do there need to be any changes? Also, does the top need to be air-tight, or does the fan mount to the PVC pipe only have to be fairly airtight to maximize the air pull?
Thanks Jake!